Vehicular air conditioning apparatus

ABSTRACT

In a vehicular air conditioning apparatus, a first partitioning member and a second partitioning member are installed at a boundary position between a first cooling section and a second cooling section of an evaporator. The evaporator is separated into the first cooling section and the second cooling section by the first and second partitioning members. In the case that air is not blown in either one of the passages that are disposed in the first cooling section and the second cooling section, air that flows through the other of the passages is prevented from flowing into the one passage through the interior of the evaporator.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a vehicular air conditioning apparatusmounted in a vehicle for blowing air into a vehicle compartment that hasbeen adjusted in temperature by a cooling means or a heating means, forthereby performing control of temperature in the vehicle compartment.

2. Description of the Related Art

In a vehicular air conditioning apparatus that is mounted in a vehicle,internal and external air is introduced into a casing by a blower, andafter cooled air, which has been cooled by an evaporator that forms acooling means, and heated air, which has been heated by a heater corethat forms a heating means, are mixed together in the casing at apredetermined mixing ratio, the mixed air is blown out from a defrosterblow-out port, a face blow-out port, or a foot blow-out port, wherebyadjustment of temperature and humidity in the vehicle compartment iscarried out.

With this type of vehicular air conditioning apparatus, for example, itis known to provide a first blower for the purpose of introducingvehicle compartment air into the casing, and a second blower for thepurpose of introducing internal and external air outside of the vehiclecompartment into the casing. In such a vehicular air conditioningapparatus, air that is introduced from an internal air introduction portby rotation of the first blower is heated by a first heat exchanger andthen is blown into the vehicle compartment through a first air passagefrom the face blow-out port or the foot blow-out port. In addition, airthat is introduced from an external air introduction port by rotation ofthe second blower is heated by a second heat exchanger and then is blowninto the vehicle compartment through a second air passage from thedefroster blow-out port. More specifically, a switching operation isperformed such that when air is blown out from the face blow-out port orthe foot blow-out port, the first blower is driven and air from theinterior of the vehicle is introduced, whereas when air is blown outfrom the defroster blow-out port, the second blower is rotated andexternal air is introduced.

Further, using separate air conditioning devices having first and secondblowers for introducing air, the first blower is arranged facing towardan external air introducing port of a duct, and the second blower isarranged facing toward an interior air introducing port. Additionally,the first blower includes a switching means, which is capable ofswitching the air that is introduced to the duct by the first blowerbetween interior air and exterior air.

In addition, the air that is introduced to the duct by the first bloweris switched between interior air and exterior air by the switchingmeans, and after the air has been adjusted in temperature by a heatingmeans and a cooling means so as to provide a desired temperaturetogether with the air introduced to the duct by the second blower, theair is blown into a desired region in the vehicle compartment through aface blow-out port, a foot blow-out port, or a defroster blow-out port.(See, for example, Japanese Laid-Open Patent Publication No. 05-178068,Japanese Laid-Open Patent Publication No. 06-040236, and JapaneseLaid-Open Patent Publication No. 06-191257.)

However, in this type of vehicular air conditioning apparatus having twofirst and second blowers, in the case that one of the first and secondblowers is halted, air which is supplied from the one blower that isbeing driven tends to flow through to the side of the other blower whilepassing through the interior of the first and second heat exchangers,and to be blown into the vehicle compartment. More specifically, insidethe vehicle compartment, blowing of air occurs unintentionally from theblow-out port for which blowing of air has been stopped, therebyimparting a sense of discomfort to occupants in the vehicle.

SUMMARY OF THE INVENTION

A general object of the present invention is to provide a vehicular airconditioning apparatus in which, by blowing of air, which is suppliedfrom first and second blowers, reliably into the vehicle compartmentfrom prescribed blow-out ports, the air conditioning apparatus therebyis capable of further improving the comfort of passengers in the vehiclecompartment.

In order to achieve the aforementioned object, the present invention ischaracterized by a vehicular air conditioning apparatus including acasing having a plurality of passages through which air flows, coolingmeans disposed inside the casing for cooling air and supplying cooledair, heating means disposed inside the casing for heating air andsupplying heated air, a damper mechanism for switching a flow state ofthe air in the passages, and a first blower and a second blower, whichare connected to the casing for supplying the air to the inside of thecasing.

In the aforementioned casing, there are provided a first passage towhich the air from the first blower is supplied, a second passage towhich the air from the second blower is supplied, a first heatexchanging section disposed in the cooling means and/or the heatingmeans, which faces toward the first passage and performs cooling and/orheating of the air that flows through the first passage, a second heatexchanging section disposed in the cooling means and/or the heatingmeans, which faces toward the second passage and performs cooling and/orheating of the air that flows through the second passage, and separatingmeans disposed between the first heat exchanging section and the secondheat exchanging section, for blocking flow of air that has passedthrough the interior of the cooling means and/or the heating means.

According to the present invention, a first heat exchanger is disposedin the cooling means and/or the heating means, which faces toward thefirst passage and performs cooling and/or heating of the air that flowsthrough the first passage, and a second heat exchanger is disposed inthe cooling means and/or the heating means, which faces toward thesecond passage and performs cooling and/or heating of the air that flowsthrough the second passage. Further, separating means is disposedbetween the first heat exchanger and the second heat exchanger, forreliably preventing flow of air between the first heat exchanger and thesecond heat exchanger in the interior of the cooling means and/or theheating means.

Accordingly, even in a state where either one of the first or secondblowers is halted, since the flow of air between the first heatexchanger and the second heat exchanger in the interior of the coolingmeans and/or the heating means can reliably be prevented by theseparating means, the supplied air is prevented from flowing through theinterior of the cooling means and/or the heating means and into thepassage on a side to which air is not intended to flow. As a result,blowing of air mistakenly from a blow-out port in the vehiclecompartment for which blowing of air has been halted is prevented, thussuitably preventing a sense of discomfort from being imparted to vehicleoccupants due to unintentional blowing of air.

The above and other objects features and advantages of the presentinvention will become more apparent from the following description whentaken in conjunction with the accompanying drawings in which a preferredembodiment of the present invention is shown by way of illustrativeexample.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an external perspective view of a vehicular air conditioningapparatus according to an embodiment of the present invention;

FIG. 2 is a cross sectional view taken along line II-II of FIG. 1;

FIG. 3 is a cross sectional view taken along line III-III of FIG. 1;

FIG. 4 is a side view of a first divided casing as seen from an interiorside thereof;

FIG. 5 is a side view of a second divided casing as seen from aninterior side thereof;

FIG. 6 is an enlarged perspective view of (an evaporator holder of) aconnecting duct that fixes an evaporator connected with the firstdivided casing;

FIG. 7 is an enlarged perspective view of the evaporator holder, whichis disposed on an inner wall surface of the second divided casing;

FIG. 8 is a plan view with partial omission showing an evaporator, whichis retained on an inner wall surface of the first divided casing;

FIG. 9 is a partial enlarged side view of the evaporator of FIG. 8;

FIG. 10 is an enlarged perspective view of a heater holder disposed onan inside wall surface of the first divided casing;

FIG. 11 is a plan view of an evaporator;

FIG. 12 is an enlarged side view showing a condition in which theevaporator of FIG. 11 is retained in an evaporator holder, and furtherwherein first and second partitioning members are installed thereon;

FIG. 13 is a perspective view with partial omission of the first andsecond partitioning members shown in FIG. 12;

FIG. 14 is a perspective view with partial omission showing a conditionduring assembly of the first partitioning member and the secondpartitioning member;

FIG. 15 is a perspective view with partial omission showing anevaporator installed state, in which the first partitioning member andthe second partitioning member shown in FIG. 14 are completelyassembled;

FIG. 16 is a cross sectional view with partial omission showing acondition in which a first partitioning member and a second partitioningmember are installed on an evaporator;

FIG. 17 is a front view, partially in cross section, showing a conditionin which a first partitioning member and a second partitioning memberare installed on an evaporator;

FIG. 18 is a plan view of an evaporator according to a modified example,in which a partition plate is installed thereon in place of the firstand second partitioning members of FIG. 17;

FIG. 19 is an enlarged perspective view with partial omission showing acondition in which tubes are retained in the partition plate of FIG. 18;

FIG. 20A is a cross sectional view showing, during a manufacturingprocess for the evaporator, a temporarily assembled state in which tubesare inserted through insertion holes of a partition plate;

FIG. 20B is a cross sectional view showing, during a manufacturingprocess for the evaporator, a state in which, from the condition shownin FIG. 20A, the insertion holes are pressed against sides of the tubesto retain the tubes;

FIG. 21 is a plan view of a heater core;

FIG. 22 is a schematic cross sectional view of the heater core shown inFIG. 21;

FIG. 23 is a cross sectional view taken along line XXIII-XXIII of FIG.21;

FIG. 24A is a side view of the heater core of FIG. 21;

FIG. 24B is an enlarged cross sectional view showing a caulked region ofa baffle plate and a housing that make up the heater core;

FIG. 25 is a schematic cross sectional view of a heater core accordingto a modified example in which a cross sectional cross-shaped baffleplate is utilized;

FIG. 26A is a cross sectional view taken along line XXVIA-XXVIA of FIG.25;

FIG. 26B is a cross sectional view taken along line XXVIB-XXVIB of FIG.25;

FIG. 27 is a partial cutaway perspective view showing a center plate anda dividing panel disposed inside the casing;

FIG. 28 is an exploded perspective view showing a condition in which acover is removed from the first and second divided casings, and adefroster damper and a sub-defroster damper are taken out therefrom;

FIG. 29 is a schematic perspective view of the vehicular airconditioning apparatus showing a condition thereof in which a vent ductand a defroster duct are connected respectively to a first vent blow-outport and a defroster blow-out port;

FIG. 30 is a plan view showing the vehicular air conditioning apparatusof FIG. 29; and

FIG. 31 is an enlarged perspective view showing the vicinity of a firstrear passage and a third rear passage formed in a lower portion of thecasing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A preferred embodiment of a vehicular air conditioning apparatus shallbe presented and explained in detail below with reference to theaccompanying drawings. In FIG. 1, reference numeral 400 indicates avehicular air conditioning apparatus according to an embodiment of thepresent invention. The vehicular air conditioning apparatus 400, forexample, is installed in a vehicle having three rows of seats arrangedalong the direction of travel of the vehicle. In the followingdescriptions, the first row of seats in the vehicle compartment of thevehicle is designated as front seats, the second row of seats isdesignated as middle seats, and the third row of seats is designated asrear seats.

Further, the vehicular air conditioning apparatus 400 is installed sothat the righthand side thereof shown in FIG. 2 (in the direction ofarrow A) is oriented toward the front side of the vehicle, whereas thelefthand side (in the direction of arrow B) is oriented toward the rearside of the vehicle. The arrow A direction shall be described as aforward direction, whereas the arrow B direction shall be described as arearward direction.

Furthermore, FIG. 2 is a cross sectional view in a central portion(taken along line II-II in FIG. 1) along the widthwise direction of avehicular air conditioning apparatus 400, whereas FIG. 3 is a crosssectional view of a region (taken along line III-III in FIG. 1) somewhatdeviated to the side of the second divided casing 418 from theaforementioned central portion.

In the embodiment of the invention discussed below, a plurality ofrotating members made up of dampers or the like are disposed in theinterior of the casing. Such rotating members are driven by rotary drivesources such as motors or the like. For purposes of simplification,drawings and explanations concerning such rotary drive sources have beenomitted.

As shown in FIGS. 1 to 5, the vehicular air conditioning apparatus 400includes a casing 402 constituted by respective air passages, a firstblower unit 406 connected through El connection duct 404 to a sideportion of the casing 402 for blowing air toward the front seat side ofthe vehicle, an evaporator (cooling means) 408 arranged inside thecasing 402 for cooling the air, a heater core (heating means) 410 forheating the air, a second blower unit 412 connected to a lower portionof the casing 402 for blowing air toward the middle seats and rear seatsof the vehicle, and a damper mechanism 414 for switching the flow of airthat flows through and inside each of the respective passages.

The casing 40:2 is constituted by first and second divided casings 416,418 having substantially symmetrical shapes, wherein a center plate 420(see FIG. 27) is disposed between the first divided casing 416 and thesecond divided casing 418. The connection duct 404 is connected on alower side portion of the first divided casing 416, and a first intakeport 422 is formed through which air is supplied from the first blowerunit 406. The first intake port 422 communicates with a first frontpassage (first passage) 424 disposed on an upstream side of theevaporator 408. As easily understood from FIG. 1, the second blower unit412 expands outwardly and is disposed at a joined region of thesubstantially symmetrical first divided casing 416 and second dividedcasing 418 that make up the casing 402, more specifically, at a centerportion of the casing 402. Further, the second blower unit 412 ispositioned inside a non-illustrated center console of the vehicle.

As shown in FIGS. 2 to 5, in the first and second divided casings 416,418, an evaporator holder 426 is formed for maintaining the evaporator408, which has a rectangular shape in cross section. The evaporatorholder 426 is provided on a lower part of the casing 402 facing thefirst intake port 422. The evaporator holder 426 includes a firstretaining member 4.28 that holds one end of the evaporator 408 that isdisposed on the forward side (in the direction of arrow A) of the casing402, and a second retaining member 430 that holds another end of theevaporator 408 that is disposed on the rearward side (in the directionof arrow B) of the casing 402. The first and second retaining members428, 430 are formed with U-shapes in cross section, which open towardone another in mutually facing directions, and extend in the widthwisedirection of the casing 402, from an inner wall surface of the firstdivided casing 416 to an inner wall surface of the second divided casing418.

Further, because the first retaining member 428 confronts the secondretaining member 430 and is disposed downwardly with respect to thesecond retaining member 430, the evaporator 408, which is retained bythe first and second retaining members 428, 430, is disposed such thatone end thereof in the forward direction of the vehicle (the directionof arrow A) is inclined downward at a predetermined angle with respectto the other end thereof.

As shown in FIG. 6, a first rib (sealing means) 432, which projects apredetermined height from the inner wall surface at a position betweenthe first retaining member 428 and the second retaining member 430, isformed on the inner wall surface of the first divided casing 416,wherein the first rib 432 abuts against one side surface of theevaporator 408. On the other hand, as shown in FIG. 7, a second rib(sealing means) 434, which projects a predetermined height from theinner wall surface of the second divided casing 418 at a positionbetween the first retaining member 42!8 and the second retaining member430, is formed on the inner wall surface thereof, confronting the firstrib 432, wherein the second rib 434 abuts against the other side surfaceof the evaporator 408.

The first and second ribs 432, 434 are formed respectively withcross-like shapes, such that horizontal ribs 432 a , 434 a (secondsealing portions) thereof, which extend from the first retaining member428 to the second retaining member 430, abut roughly in the center ofthe evaporator 408 to divide the evaporator 408 in half in the thicknessdirection thereof. On the other hand, vertical ribs (first sealingportions) 432 b , 434 b , which are perpendicular to the horizontal ribs432 a , 434 a , abut against a boundary portion in the evaporator 408 ofa first cooling section 436 through which air supplied from the firstblower unit 406 passes, and a second cooling section 438 through whichair supplied from the second blower unit 412 passes (refer to FIG. 8).The vertical ribs 432 b , 434 b are disposed substantially parallel tothe blowing direction of air that is supplied to the evaporator 408 fromthe first front passage 424 and the first rear passage 570. Statedotherwise, the horizontal ribs 432 a , 434 a face toward the first frontpassage 424 and the first rear passage 570 and are formed substantiallyparallel with the lower surface (supply surface) of the evaporator 408on the upstream side thereof to which the air is supplied. Further,compared to the second rib 434, the first rib 432 is set to have agreater height from the inner wall surface of the first divided casing416, and the horizontal rib 432 a and vertical rib 432 b are formedperpendicularly with respect to the inner wall surface.

More specifically, by abutment of the horizontal ribs 432 a , 434 a ofthe first and second ribs 432, 434 against side surfaces of theevaporator 408, air is prevented from flowing to the downstream sidebetween inner wall surfaces of the first and second divided casings 416,418 and the evaporator 408. On the other hand, by abutment of thevertical ribs 432 b , 434 b of the first and second ribs 432, 434against the boundary portion of the first cooling section 436 and thesecond cooling section 438, air supplied from the first blower unit 406is prevented from flowing through the side of the second cooling section438 at times when the second blower unit 412 is halted, and conversely,air supplied from the second blower unit 412 is prevented from flowingthrough the side of the first cooling section 436 at times when thefirst blower unit 406 is halted.

Furthermore, on the inner wall surface of the first divided casing 416,a plurality of reinforcement ribs (reinforcement members) 440 are formedsubstantially parallel with the vertical ribs 432 b . The reinforcementribs 440 are disposed with respect to upper and lower surface sides ofthe horizontal rib 432 a , and are formed with substantially triangularshapes in cross section, which taper in a direction away from the innerwall surface (see FIGS. 6 and 9).

Further, as shown in FIGS. 2 and 3, on the first and second dividedcasings 416, 418, a heater holder 442 is formed for maintaining aheater, which has a rectangular shape in cross section. The heaterholder 442 is provided upwardly of the evaporator holder 426. The heaterholder 442 includes a first retaining member 444 that holds one end ofthe heater core 410 that is disposed on the forward side (in thedirection of arrow A) of the casing 402, and a second retaining member446 that holds another end of the heater core 410 that is disposed onthe rearward side (in the direction of arrow B) of the casing 402. Thefirst retaining member 404 is formed to cover one end portion of theheater core 410, whereas the second retaining member 446 is formed tocover a lower half part only of the other end of the heater core 410.The first and second retaining members 444, 446 extend along thewidthwise direction of the casing 402, from an inner wall surface of thefirst divided casing 416 to an inner wall surface of the second dividedcasing 418.

Further, because the first retaining member 444 confronts the secondretaining member 446 and is disposed downwardly with respect to thesecond retaining member 446, the heater core 410, which is retained bythe first and second retaining members 444, 446, is disposed such thatone end thereof in the forward direction of the vehicle (the directionof arrow A) is inclined downward at a predetermined angle with respectto the other end thereof.

Furthermore, as shown in FIG. 10, a rib 448, which projects apredetermined height from the inner wall surface at a position betweenthe first retaining member 444 and the second retaining member 446, isformed on the inner wall surface of the first divided casing 416, suchthat the rib 448 abuts against one side surface of the heater core 410.The rib 448 is formed with a substantially cross-like shape, such that ahorizontal rib 448 a thereof, which extends from the first retainingmember 444 to the second retaining member 446, abuts roughly in thecenter of the heater core 410 to divide the heater core 410 in half inthe thickness direction thereof. On the other hand, a vertical rib 448 b, which is perpendicular to the horizontal rib 448 a , abuts against aboundary portion in the heater core 410 of a first heating section 450through which air supplied from the first blower unit 406 passes, and asecond heating section 452 through which air supplied from the secondblower unit 412 passes (refer to FIG. 4). Further, in the second dividedcasing 418, a region thereof opens in a direction facing toward theheater core 410.

More specifically, by abutment of the horizontal rib 448 a of the rib448 against a side surface of the heater core 410, air is prevented fromflowing to the downstream side between the inner wall surface of thefirst divided casing 416 and the heater core 410. At the same time, byabutment of the vertical rib 448 b against the boundary portion of thefirst heating section 450 and the second heating section 452, airsupplied from the first blower unit 406 is prevented from flowingthrough the side of the second heating section 452 at times when thesecond blower unit 412 is halted, and conversely, air supplied from thesecond blower unit 412 is prevented from flowing through the side of thefirst heating section 450 at times when the first blower unit 406 ishalted.

Further, as shown in FIGS. 2 to 5, on the bottom portion of the casing402, the first guide panel 456 is formed, which faces toward the firstfront passage 424 on a forward side (in the direction of arrow A)adjacent to the first drain ports 454 a , 454 b . The first guide panel456 is arranged in an upstanding manner along the extending direction ofthe first front passage 424. An upper end part thereof extends to thevicinity of the lower surface of the evaporator 408, and is bent in adirection (the direction of arrow B) separating from the evaporatorholder 426 that retains the evaporator 408.

Owing thereto, in the evaporator 408, for example, although watercondensation is generated when air passing through the interior of theevaporator 408 is cooled, because one end side thereof is disposed to beinclined downwardly at a predetermined angle, moisture that is generatedinside the evaporator 408 can be moved to one end side, i.e., the frontside of the vehicle (in the direction of arrow A), along the lowersurface of the evaporator 408.

As shown in FIG. 11, in the evaporator 408, for example, tubes 458 a ,458 b are formed from thin plates of aluminum or the like, and fins 460,which are folded in a serpentine-like undulating shape, are disposedrespectively between the stacked tubes 458 a , 458 b . On the fins 460,a plurality of louvers 462 are formed, which are cut out so as to beinclined at predetermined angles with respect to the planar surface ofthe fins 460. By causing a coolant medium to flow through the interiorof the tubes 458 a , 458 b , air that passes through the louvers 462 andflows between the fins 460 is cooled by the coolant medium and issupplied to the downstream side as chilled air. At the evaporator 408,the paired tubes 458 a , 458 b are arrayed in parallel and arranged intwo layers in the thickness direction of the evaporator 408.

Further, the evaporator 408 includes the first cooling section 436,which cools air supplied from the first blower unit 406, and the secondcooling section 438, which cools air supplied from the second blowerunit 412. Additionally, the first cooling :section 436 is arranged inthe forward direction (the direction of arrow A) of the casing 402,whereas the second cooling section 438 is arranged in the rearwarddirection (the direction of arrow B) of the casing 402.

At the boundary region between the first cooling section 436 and thesecond cooling section 438, as shown in FIG. 16, a pair of first andsecond partitioning members 464, 466 are installed for blockingcommunication of air between the first cooling section 436 and thesecond cooling section 438. As shown in FIGS. 13 to 15, the first andsecond partitioning members 464, 466 are formed from a resin material,for example, and are equipped with straightly formed base portions 468 a, 468 b , and a plurality of sealing portions 470 a , 470 b , whichproject at a predetermined length from the lower surface of the baseportions 468 a , 468 b . Also, projections 472 a , 472 b are formedthereon, which project in a direction perpendicular to the lengthwisedirection, centrally along the lengthwise direction of the sealingportions 470 a , 470 b . The sealing portions 470 a , 470 b are formedwith the same length, and are disposed so as to be separated mutually atequal intervals along the base portions 468 a , 468 b t. Further, theprojections 472 a , 472 b project in the same directions with respect tothe sealing portions 470 a , 470 b.

Additionally, as shown in FIG. 12, the first partitioning member 464 ismounted on a lower surface side of the evaporator 408 on the upstreamside thereof, such that the sealing portions 470 a thereof are insertedrespectively between the stacked tubes 458 a , 458 b in the evaporator408, and the base portion 468 a abuts against the lower surface. On theother hand, the second partitioning member 466 is mounted on an uppersurface side of the evaporator 408 on the downstream side thereof, suchthat the sealing portions 470 b thereof are inserted on an opposite sidefrom the first partitioning member 464 between the tubes 458 a , 458 b ,and the base portion 468 b abuts against the upper surface.

At this time, as shown in FIG. 16, the sealing portions 470 a of thefirst partitioning member 464 and the sealing portions 470 b of thesecond partitioning member 466 are offset from each other along thedirection of extension (the direction of arrow C) of the base portions468 a , 468 b , and further, overlap in the direction of extension ofthe tubes 458 a , 458 b . Owing to the two sealing portions 470 a , 470b , which are mutually overlapped in this manner, intervals betweenadjacent tubes 458 a , 458 b in the same layer are sealed respectively.Next, projections 472 a of the first partitioning member 464 and theprojections 472 b of the second partitioning member 466 are insertedbetween the adjacent tubes 458 a and the tubes 458 b , while the firstpartitioning member 464 and the second partitioning member 466 are slidrespectively along the direction of extension (the direction of arrow C)of the base portions 468 a , 468 b . Consequently, the projections 472 aof the first partitioning member 464 and the projections 472 b of thesecond partitioning member 466 overlap in the direction of extension ofthe tubes 458 a , 458 b , and gaps occurring between the tubes 458 adisposed on the upper surface side and the tubes 458 b disposed on thelower surface side are sealed (see FIG. 17).

Consequently, since the flow of air between the tubes 458 a , 458 b ,which are disposed in two layers, is blocked by the first and secondpartitioning members 464, 466 installed between the first coolingsection 436 and the second cooling section 438, flow of air between thefirst cooling section 436 and the second cooling section 438 isprevented (see FIGS. 16 and 17).

Moreover, in a condition of being installed on the evaporator 408, thebase portions 468 a , 468 b of the first and second partitioning members464, 466 are retained respectively in base holders 578, 588, which areformed in the casing 402 (see FIG. 12).

Further, the means for blocking communication of air between the firstcooling section 436 and the second cooling section 438 in the evaporator408 is not limited to the aforementioned first and second partitioningmembers 464, 466. For example, as shown in FIG. 18, in place of theaforementioned first and second partitioning members 464, 466, aplate-shaped partition plate 474 may also be disposed at the boundaryregion between the first cooling section 436 and the second coolingsection 438.

The partition plate 474, as shown in FIGS. 18 and 19, includes aplurality of insertion holes 476 therein through 5i which the tubes 458a , 458 b are inserted. Pressing members 478, which are inclined atpredetermined angles from the partition plate 474 about centers of theinsertion holes 476, are formed in openings of the insertion holes 476.The pressing members 478 are substantially chevron shaped in crosssection about the center of the insertion holes 476, and are tiltablewith a certain resiliency in a radial direction of the insertion holesabout a fulcrum point defined by an adjoining region with the partitionplate 474.

In addition, for example, a cut line or seam is disposed in the fins 460a forming a boundary between the first cooling section 436 and thesecond cooling section 438. After the partition plate 474 is insertedbetween the fins 460 a , the tubes 458 a , 458 b are insertedrespectively through the insertion holes 476 of the partition plate 474(see FIG. 20A). Then, in such a provisionally assembled state, as shownin FIG. 20B, a pressing force P is applied respectively from the rightand left in a direction to approach mutually toward the plural tubes 458a , 458 b , and while heat is applied thereto, welding (e.g., usingsolder) is carried out, whereby the tubes 458 a , 458 b , the fins 460 a, and the partition plate 474 are mutually bonded together tomanufacture the evaporator 408 (see FIG. 18).

At this time, the pressing members 478 of the partition plate 474contact the side surfaces of the tubes 458 a , 458 b due to the pressingforce P, and further, because the tubes 458 a , 458 b are retained bythe resilient force thereof, a state in which the partition plate 474and the tubes 458 a , 458 b are mutually positioned can be realized. Byperforming welding in such a positioned state, for example, generationof thermal shrinkage after welding and the occurrence of gaps betweenthe partition plate 474 and the tubes 458 a , 458 b is prevented.

On the other hand, as shown in FIG. 2, on a downstream side of theevaporator 408, a second front passage 482 is formed, through which airhaving passed through the first cooling section 436i is supplied.Upwardly of the second front passage 482, a third front passage 484 anda fourth front passage 486 are formed in a branching or bifurcatedmanner. Further, a first air mixing damper 488 is rotatably disposed inthe second front passage 482 so as to face toward the branching portionof the third front passage 484 and the fourth front passage 486.

By rotation of the first air mixing damper 488, the blowing conditionand blowing rate of the cooled air that has passed through theevaporator 408 into the third front passage 484 and the fourth frontpassage 486 is adjusted. The third front passage 484 is arranged in theforward direction (the direction of arrow A), whereas the fourth frontpassage 486 is arranged in the rearward direction (the direction ofarrow B), of the casing 402. The heater core 410 is disposed on adownstream side of the fourth front passage 486.

Upstream of the third front passage 484, a cooling vent damper 490 isdisposed in a downward direction facing the second front passage 482,for switching a communication state between the second front passage 482and the third front passage 484. More specifically, because the coolingvent damper 490 is arranged in the vicinity of the evaporator 408, thecooling vent damper 490 is disposed such that, under a switching actionthereof, chilled air cooled by the evaporator 408 is supplied directlyinto the third front passage 484.

Further, the third front passage 484 extends upwardly, and a first ventblow-out port 492 opens at an upper portion on the downstream sidethereof, where a vent damper 494 is rotatably disposed. The vent damper494 switches a blowing state of air that flows through the third frontpassage 484, when the air is blown to the first vent blow-out port 492and a later described sixth front passage 520, and also is capable ofadjusting the blowing rate thereof.

The heater core 410 is arranged to straddle between the first dividedcasing 416 and the second divided casing 418, and is disposed such thatone end thereof in the forward direction of the vehicle (the directionof arrow A) is inclined downward at a predetermined angle with respectto the other end thereof in the rearward direction of the vehicle. Theheater core 410 includes the first heating section 450 that heats airsupplied from the first blower unit 406, and the second heating section452 that heats air supplied from the second blower unit 412, wherein thefirst heating section 450 is arranged on the forward side of the casing402.

As shown in FIG. 21, in the heater core 410, tubes 496 a , 496 b areformed from a pair of thin plates of aluminum or the like, and fins (notshown), which are folded in a serpentine-like undulating shape, aredisposed respectively between the stacked tubes 496 a , 496 b . On thefins, a plurality of louvers are formed, which are cut out so as to beinclined at predetermined angles with respect to planar 5 surfaces ofthe fins. By causing heated water to flow through the interior of thetubes 496 a , 496 b , air that passes through the louvers and flowsbetween the fins is heated by the heated water and is supplied to thedownstream side as heated air. At the heater core 410, the tubes 496 a ,496 b are arrayed in parallel and arranged in two layers in thethickness direction of the heater core 410.

On both ends of the tubes 496 a , 496 b , respective hollow tankportions 503 a, 503 b are connected, which retain the heated water thatflows inside the tubes. In addition, as shown in FIGS. 21 and 22, on oneof the tank portions 503 a on a side surface of the heater core 410, asupply conduit 498 through which heated water is supplied from theexterior, and a discharge conduit 500 through which heated water havingcirculated through the interior of the heater core 410 is discharged,are connected respectively. The discharge conduit 500 is arranged in thevicinity of a corner portion in a rear upward direction of the casing402, whereas the supply conduit 498 is arranged in parallel adjacent tothe discharge conduit 500.

On the other hand, in the interior of the tank portion 503 a , a baffleplate 502 is disposed, which is substantially L-shaped in cross section.The baffle plate 502 extends at a predetermined width in an extendingdirection (the direction of arrow E) of the supply conduit 498 and thedischarge conduit 500, and the baffle plate 502 is arranged between oneof the tubes 496 a and the other of the tubes 496 b . Additionally, asshown in FIG. 23, the pair of tubes 496 a , 496 b are separated insidethe tank portion 503 a by the baffle plate 502.

The baffle plate 502, as shown in FIG. 22, is made up from a planarportLon 504 arranged centrally in the thickness direction of the heatercore 410 and a bent portion 506, which is bent at a right angle at oneend of the planar portion 504. The bent portion 506 is disposed betweenthe discharge conduit 500 and the supply conduit 498.

Further, on the baffle plate 502, a plurality of caulking projections507 (see FIG. 24A) are disposed respectively on both ends thereof alongthe longitudinal direction (the direction of arrow E) of the heater core410. After such caulking projections 507 have been inserted throughholes formed in a side surface of the tank portions 503 a , 503 b toproject outwardly therefrom, the projecting regions thereof are pressedand crushed by a non-illustrated jig or the like (see FIG. 24B).Moreover, the caulking projections 507 are formed with rectangularshapes in cross section and are disposed while being mutually separatedat predetermined distances on side surfaces of the planar portion 504and the bent portion 506. Together therewith, holes facing the planarportion 504 are disposed centrally in the thickness direction on thetank portion 503 a , and holes facing the bent portion 506 are disposedat positions between the supply conduit 498 and the discharge conduit500 (see FIG. 24A).

As a result thereof, the baffle plate 502 is affixed securely withrespect to the tank portion 503 a disposed on the heater core 410.

In addition, heated water supplied from the supply conduit 498 issupplied, via the one tank portion 503 a , to one of the tubes 496 a ,which is disposed on the upper side. Then, after the heated water hasflowed through the tube 496 a to the other end side of the heater core410, the heated water reverses direction inside the tank portion 503 bdisposed at the other end of the heater core 410, passes through theother tube 496 b disposed on the lower side, and flows along the lowersurface side of the baffle plate 502 back to the one end side of theheater core 410, whereupon the heated water is discharged from thedischarge conduit 500.

At this time, since the discharge conduit 500 is connected at an uppercorner portion 411 (in the rearward direction) of the heater core 410,which is inclined at a predetermined angle, even in the case thatentrapped or retained air is generated inside the heater core 410, theair can be reliably discharged to the exterior through the dischargeconduit 500, which is connected at the upper corner portion 411 wheresuch retained air is generated. Stated otherwise, the discharge conduit500 is connected at an uppermost position in the heater core 410, theheater core 410 being disposed at a predetermined angle of inclinationinside the casing 402.

Further, the baffle plate 502, which is disposed inside the heater core410, is not limited to having an L-shape in cross section, as describedabove. For example, as shown in FIG. 25, a baffle plate 508 having across-like shape in cross section in a heater core 410 a may also beused.

As shown in FIG. 25, the baffle plate 508 includes a planar portion 510and a vertical portion 512 that intersects at a right angle with respectto the planar portion 510. The planar portion 510 is arranged centrallyin the thickness direction of the heater core 410 a , and the verticalportion 512 is arranged between the discharge conduit 500 and the supplyconduit 498.

Further, as shown in FIG. 26A, on the vertical portion 512, on the lowersurface side of the heater core 410 a , a through hole 512 a opensthrough which the circulated heated water can flow. Furthermore, asshown in FIG. 26B, on the planar portion 510 facing the dischargeconduit 500, another through hole 510 a opens through which the heatedwater can flow. Additionally, in the heater core 410 a employing thebaffle plate 508, heated water supplied from the supply conduit 498 issupplied to the interior of one of the tank portions 503 a , and flowsalong an upper surface side of the baffle plate 508 and is supplied toone of the tubes (not shown). Additionally, after reversing in directionat the tank portion 503 b disposed on the other end side of the heatercore 410 a , the heated water flows along the lower surface side of thebaffle plate 508, and after flowing to the through hole 510 a of theplanar portion 510 from the through hole 512 a of the vertical portion512, the heated water is discharged from the discharge conduit 500 viathe tank portion 503 a.

At this time as well, since the discharge conduit 500 is connected atan, upper corner portion 411 a (in the rearward direction) of the heatercore 410 a , which is inclined at a predetermined angle, even in thecase that entrapped or retained air is generated inside the heater core410 a , the air can be reliably discharged to the exterior through thedischarge conduit 500, which is connected at the upper corner portion411 a where such retained air is generated.

As shown in FIG. 3, on the downstream side of the heater core 410, afifth front passage 514 is formed. The fifth front passage 514 extendsin the forward direction (in the direction of the arrow A), and at alocation that merges with the third front passage 484, a temperaturecontrol damper 516 is provided, and together therewith, sub-defrosterdampers 518 a , 518 b are disposed in an upward direction facing theheater core 410. Under a rotating action of the temperature controldamper 516, a communication state between the fifth front passage 514and the third front passage 484 is switched, for deflecting the blowingdirection of warm air supplied from the fifth front passage 514 into thethird front passage 484.

On the other hand, the sub-defroster dampers 518 a , 518 b are disposedso as to be capable of switching a communication state between the fifthfront passage 514 and the sixth front passage 520 formed thereabove. Byrotating the sub-defroster dampers 518 a , 518 b and therebyestablishing communication between the fifth front passage 514 and thesixth front passage 520, i.e., by shortening the fluid passage from thefifth front passage 514 to the sixth front passage 520, warm air heatedby the heater core 410 can be supplied directly to the sixth frontpassage 520 without flowing through the third front passage 484, in astate in which ventilation resistance of the fluid passage is reduced.

Owing thereto, in the case that a heat mode for blowing air in thevicinity of the feet of passengers, or a defroster mode for blowing airin the vicinity of the front window of the vehicle, is selected, theblowing rate can be increased to quickly heat such areas.

Stated otherwise, even without increasing the rotation of the firstblower unit 406, the blowing rate of air during the heat mode and thedefroster mode can be increased.

The sixth front passage 520 communicates with the downstream side of thethird front passage 484 through the forwardly disposed opening, andcommunicates with a later-described seventh front passage 522 throughthe rearwardly disposed opening. A defroster blow-out port 524 opensupwardly of the sixth front passage 520, with a pair of defrosterdampers 526 a , 526 b being disposed rotatably therein facing thedefroster blow-out port 524.

The defroster dampers 526 a , 526 b are provided to switch the blowingstate when the air supplied to the sixth front passage 520 is blown outfrom the defroster blow-out port 524, and further are capable ofadjusting the blowing rate thereof.

Further, at a downstream side of the sixth front passage 520, a pair ofheat dampers 528 made up from a butterfly valve are rotatably disposed(see FIG. 2). By rotating the heat dampers 528, the blowing state of airis switched, when air supplied from the sixth front passage 520 is blownout through later-described seventh and eighth front passages 522, 540or through the defroster blow-out port 524, and further, the blowingrate of such air can be adjusted.

Further, as shown in FIG. 27, the sixth front passage 520 is dividedinto two sections by the center plate 420, which is disposed centrallyin the casing 402 in the widthwise direction thereof. Also, the sixthfront passage 520 is further divided respectively by a pair of dividingpanels 530 a , 530 b , which are disposed roughly centrally in thewidthwise direction, respectively, of the first and second dividedcasings 416, 418. In addition, in the sixth front passage 520, betweenthe center plate 420 and the dividing panels 530 a , 530 b , a pair ofheat dampers 528 are disposed, such that air that flows between thecenter plate 420 and the dividing panels 530 a , 530 b is directedoutwardly to a first heat passage 538 (discussed later) under rotatingactions of the heat dampers 528.

On the other hand, the defroster dampers 526 a , 526 b are disposedrespectively between the dividing panels 530 a , 530 b and inner wallsurfaces of the first and second divided casings 416, 418, so that airthat flows between the dividing panels 530 a , 530 b and inner wallsurfaces of the first and second divided casings 416, 418 is directedoutwardly, respectively, from side portions 534 of the defrosterblow-out port 524 under rotating actions of the defroster dampers 526 a, 526 b.

More specifically, the sixth front passage 520 is divided into foursections inside the casing 402 by the pair of dividing panels 530 a ,530 b and the center plate 420, such that the blowing state and blowingrate of air that is blown from the defroster blow-out port 524 isswitched by the defroster dampers 526 a , 526 b.

As shown in FIG. 28, by respectively removing covers 536 a , 536 b ,which are disposed alongside the defroster dampers 526 a , 526 b and thesub-defroster dampers 518 a , 518 b in the first and second dividedcasings 416, 418, maintenance thereon, such as exchanging and adjustmentof rotation angles, etc., can easily be carried out on the defrosterdampers !526 a , 526 b and the sub-defroster dampers 518 a , 518 b.

The seventh front passage 522 communicates with a first heat blow-outport (not shown) through a first heat passage 538 for the purpose ofblowing air in the vicinity of the feet of passengers in the front seatsin the vehicle compartment. The eighth front passage 540 extendsdownwardly in a curving manner and communicates with a second heatblow-out port (not shown) upwardly of the second blower unit 412 througha second heat passage (not shown) for the purpose of blowing air in thevicinity of the feet of passengers in the middle seats in the vehiclecompartment.

In the casing 402, the first vent blow-out port 492 and the defrosterblow-out port 524 open upwardly of the casing 402, and further, thefirst vent blow-out port 492 is arranged on a forward side (in thedirection of arrow A), whereas the defroster blow-out port 524 isarranged rearwardly, substantially centrally in the casing 402 withrespect to the first vent blow-out port 492 (see FIG. 3).

As shown in FIGS. 29 and 30, a vent duct 544, which extends whilecurving toward the rearward side of the vehicle (in the direction ofarrow B), is connected to the first vent blow-out: port 492 forsupplying mixed air to the vicinity of faces of passengers in the frontseats of the vehicle compartment: from the first vent blow-out port 492.A pair of center vent ducts 546 that make up the vent duct 544 areconnected to a center portion of the first vent blow-out port 492 andblow air toward the center of the front seats, whereas another pair ofside vent ducts 548, which are connected to both ends of the first ventblow-out port 492, extend in lateral directions of the front seats, andblow air toward the driver's seat and passenger seat sides thereof.

On the other hand, a defroster duct 550, which extends while curvingtoward the forward side of the vehicle (in the direction of arrow A), isconnected to the defroster blow-out port 524 for supplying mixed air tothe vicinity of the front window in the vehicle compartment from thedefroster blow-out port 524. The defroster duct 550 is constituted bycenter defroster ducts 552, which are branched in a forked manner so asto avoid the center vent ducts 546 that extend upwardly of the defrosterblow-out port 524, and extend toward an unillustrated front window, andside defroster ducts 554, which extend perpendicularly to the centerdefroster ducts 552 in lateral directions together with the side ventducts 548. As a result, since locations where the respective ducts areaccommodated are not increased in volume, the vehicular air conditioningapparatus 400 can be made small in size. Further, the center defrosterducts 552 extend toward the forward side (in the direction of arrow A)straddling upwardly over the side vent ducts 548.

More specifically, the vent duct 544 connects to the first ventblow-out: port 492 disposed on the forward side and extends rearwardly(in the direction of arrow B) toward the vehicle compartment, whereasthe defroster duct 550 connects to the defroster blow-out port 524disposed on the rearward side and extends in a forward direction (in thedirection of arrow A) on the front window side while crossing over thevent duct 544.

In this manner, by arranging the first vent blow-out port 492 on theforward side of the casing 402, the third front passage 484 thatcommunicates between the downstream side of the evaporator 408 and thefirst vent blow-out port 492 can be oriented upwardly and arranged in astraight line fashion, while the defroster blow-out port 524 can bedisposed upwardly of the heater core 410.

In this case, the center defroster ducts 552 and the side defrosterducts 554 that constitute the defroster duct 550 extend respectivelyfrom side portions 534 of the defroster blow-out port 524, such that thecenter vent ducts 546 are oriented and can extend rearwardly (in thedirection of arrow B) from the first vent blow-out port 492, which isdisposed forwardly (in the direction of arrow A) of the defrosterblow-out port 524.

The first blower unit 406 includes an intake damper (not shown) in whichan external air intake port 556 connected to a duct (not shown) for thepurpose of introducing external air and an internal air intake port 558for introducing internal air are arranged in an opening thereof, andwhich carries out switching between the external and internal air, and afirst blower fan (first blower) 560 that supplies air that is taken into the interior of the casing 402. A blower case 562 in which the firstblower fan 560 is accommodated communicates with the interior of thecasing 402 through the connection duct 404 connected to the first intakeport 422. Rotation of the first blower fan 560 is controlled by a fanmotor (not shown), which is driven under the control of anon-illustrated rotation control device.

On the other hand, in a lower portion of the casing 402, as shown inFIGS. 2 and 3, a second intake port 568 through which air is suppliedfrom the second blower unit 412 is formed at a rearward sideperpendicular to the first intake port 422. The second intake port 568opens at a position on an upstream side of the evaporator 408, andcommunicates with the first rear passage 570 (second passage), andfurther, is formed alongside the first intake port 422 via the firstrear passage 570 and a first dividing wall 572.

The second blower unit 412 includes the second blower fan (secondblower) 574, which supplies air that has been taken in to the interiorof the casing 402. A blower case 576 in which the second blower fan 574is accommodated is connected to the second intake port 568 of the casing402 and communicates with the first rear passage 570. In the same manneras the first blower fan 560, rotation of the second blower fan 574 iscontrolled by a fan motor (not shown) driven under the control of anunillustrated rotation control device.

On a downstream side of the first rear passage 570, the evaporator 408is disposed such that the second cooling section 438 thereof faces thefirst rear passage 570. The first dividing wall 572, which is formedbetween the first rear passage 570 and the first front passage 424,extends to the first and second partitioning members 464, 466 that areinstalled on the evaporator 408. The first partitioning member 464 isretained in the base holder 578, which is disposed at the end of thefirst dividing wall 572.

More specifically, since the first dividing wall 572 extends to thefirst and second partitioning members 464, 466 that are installed on theevaporator 408, air that flows to the evaporator 408 through the firstrear passage 570 is prevented from mixing with air that flows to theevaporator 408 through the first front passage 424.

Further, a second guide panel 580 for guiding moisture ejected from theevaporator 408 to the bottom of the casing 402 is formed in the firstrear passage 570 while being separated a predetermined distance from thefirst dividing wall 572. An upper end of the second guide panel 580extends to the vicinity of the base holder 578 disposed on the firstdividing wall 572, and is bent rearwardly so as to be separated apredetermined distance from the base holder 578 (see FIG. 7).

In addition, in the event that moisture generated by the second coolingsection 438 of the evaporator 408 flows to the forward side (in thedirection of arrow A) along the lower surface of the evaporator 408 andis retained in the first partitioning member 464 and the base holder578, or when such moisture comes into contact with the upper end of thesecond guide panel 580, the moisture is guided and flows downwardlyalong the second guide panel 580. The moisture is then discharged fromthe casing 402 through a second drain port 582 disposed between thefirst dividing wall 572 and the second guide panel 580. In this case,the upper end of the second guide panel 580 is flexed or bent rearwardly(in the direction of arrow B), so as to be separated a predetermineddistance from the base holder 578 (see FIG. 2), whereby the amount ofair that reaches the first partitioning member 464 and the base holder578 is reduced. Consequently, moisture that has accumulated in the firstpartitioning member 464 and the base holder 578 is prevented fromadhering again to the second cooling section 438, while in addition,moisture can be reliably discharged from the second drain port 582.

Owing thereto, condensed water that is generated in the evaporator 408is prevented from accumulating and freezing in the evaporator 408.

On a downstream side of the evaporator 408, the second rear passage 584is formed, to which air having passed through the second cooling section438 of the evaporator 408 is supplied. The second rear passage 584 isseparated from the second front passage 482 by a second dividing wall586, wherein the second partitioning member 466 is retained in a baseholder 588 disposed at the end of the second dividing wall 586.Specifically, because the second dividing wall 586 extends to the secondpartitioning member 466 installed on the evaporator 408, on thedownstream side of the evaporator 408 as well, air that flows to thesecond cooling section 438 of the evaporator 408 through the first rearpassage 570 does not intermix with air that passes through the firstfront passage 424 and flows to the first cooling section 436 of theevaporator 408.

In the second rear passage 584, a second air mixing damper 590 isdisposed rotatably therein facing the heater core 410 for mixing cooledair and heated air at a predetermined mixing ratio to thereby producemixed air. The second air mixing damper 590 switches the communicationstate between the second rear passage 584 and an upstream or downstreamside of a third rear passage 592, which is connected to a downstreamside of the heater core 410. Consequently, by rotating the second airmixing damper 590, cool air that is cooled by the evaporator 408 andsupplied to the second rear passage 584 and warm air that is heated bythe heater core 410 and which flows through the third rear passage 592are mixed at a predetermined mixing ratio within the third rear passage592 and blown out therefrom.

Stated otherwise, the third rear passage 592 functions as a mixingsection for mixing warm air and cool air, which is then blown out to themiddle seats and rear seats in the vehicle.

Further, as shown in FIG. 2, the third rear passage 592, after bendingto circumvent the other end of the heater core 410, extends downwardly,and midway therein, an opening is formed that communicates with thesecond rear passage 584. On a downstream side extending further downwardfrom the opening, as shown in FIG. 31, the third rear passage 592branches in a forked manner, branching in widthwise directions of thecasing 402 about the first rear passage 570, and after extending so asto avoid the first rear passage 570 on both sides thereof, the thirdrear passage 592 merges again downward of the first rear passage 570.Stated otherwise, the third rear passage 592 is formed so as to crossover the first rear passage 570.

As shown in FIGS. 2 and 3, on a downstream side of the third rearpassage 592, fourth and fifth rear passages 594, 596 communicatetherewith. A rotatable mode switching damper 598 is disposed at abranching location thereof, which serves to switch the blowing state ofair to the fourth and fifth rear passages 594, 596, which branchrespectively from the third rear passage 592, and also to adjust theblowing rate of air thereto.

The fourth and fifth rear passages 594, 596 extend toward a rearwarddirection of the vehicle. The fourth rear passage 594 communicates witha second vent blow-out port (not shown) for blowing air in the vicinityof faces of passengers in the middle seats in the vehicle compartment.The fifth rear passage 596 communicates with second and third heatblow-out ports (not shown) for blowing air in the vicinity of the feetof passengers in the middle and rear seats.

Specifically, air supplied from the second blower unit 412 is directedinto the casing 402 through the second intake port 568, and isselectively supplied to the second vent blow-out port, and the secondand third heat blow out ports, which are arranged to face the middleseats and rear seats in the vehicle, through the first through fifthrear passages 570, 584, 592, 594, 596.

Moreover, because the aforementioned second to seventh front passages482, 484, 486, 514, 520, 522 are divided in half at a substantiallycentral portion of the casing 402 by the center plate 420, the second toseventh front passages 482, 484, 486, 514, 520, 522 are disposedrespectively inside of the first: and second divided casings 416, 418.

The vehicular air conditioning apparatus 400 according to the embodimentof the present invention is basically constructed as described above.Next, operations and effects of the invention shall be explained.

First, when operation of the vehicular air conditioning apparatus 400 isstarted, the first blower fan 560 of the first blower unit 406 isrotated under the control of a rotation control device (not shown), andair (interior or exterior air) that is taken in through a duct or thelike is supplied to the first front passage 424 of the casing 402through the connection duct 404. Simultaneously, air (interior air) thatis taken in by rotation of the second blower fan 574 of the secondblower unit 412 under the control of a non-illustrated rotation controldevice is supplied to the first rear passage 570 from the blower case576 while passing through the second intake port 568. In the followingdescriptions, air supplied to the interior of the casing 402 by thefirst blower fan 560 shall be referred to as “first air,” and airsupplied to the interior of the casing 402 by the second blower fan 574shall be referred to as “second air.”

The first air and the second air supplied to the interior of the casing402 are each cooled by passing respectively through the first and secondcooling sections 436, 438 of the evaporator 408, and flow respectivelyas chilled air to the second front passage 482 and the second rearpassage 584, in which the first and second air mixing dampers 488, 590are disposed. In this case, because the interior of the evaporator 408is divided into the first cooling section 436 and the second coolingsection 438 by a non-illustrated partitioning means, the first air andthe second air do not mix with one another.

Herein, in the case that a vent mode is selected by a passenger using acontroller (not shown) inside the vehicle compartment for blowing air inthe vicinity of the face of the passenger, by blocking communicationbetween the second front passage 482 and the fourth front passage 486 bymeans of the first air mixing damper 488, the first air (cooled air)flows from the second front passage 482 to the third front passage 484.In this case, the temperature control damper 516 blocks communicationbetween the fifth front passage 514 and the third front passage 484.Additionally, concerning the first air (cooled air) that flows to thethird front passage 484, since the vent damper 494 is rotated into aposition that blocks communication between the third front passage 484and the sixth front passage 520, the first air is blown from the openfirst vent blow-out port 492, through the vent duct 544, and in thevicinity of the face of a passenger riding in the front seat in thevehicle compartment.

On the other hand, concerning the second air (cooled air), since flow tothe second heating section 452 of the heater core 410 is interrupted bythe second air mixing damper 590, the second air flows downstream fromthe second rear passage 584 through the third rear passage 592.Additionally, the second air (cooled air) is blown in the vicinity ofthe face of a passenger in the middle seat in the vehicle compartmentfrom the second vent blow-out port (not shown) through the fourth rearpassage 594 under a switching operation of the mode switching damper598.

Further, for example, in the vent mode, in the case that the interior ofthe vehicle compartment is quickly cooled, the cooling vent damper 490enables communication between the second front passage 482 and the thirdfront passage 484. As a result, since the blowing rate of the first air(cooled air) that flows to the third front passage 484 from the secondfront passage 482 increases, the vehicle compartment can be cooledquickly by the first air, which is blown from the first vent blow-outport 492 through the vent duct 544.

In this case, since it is unnecessary to mix warm air supplied to thefifth front passage 514 with the cool air of the third front passage484, the temperature control damper 516 is rotated to becomesubstantially parallel with the third front passage 484 and to blockcommunication between the fifth front passage 514 and the third frontpassage 484. As a result, cooled air in the third front passage 484 canbe supplied to the first vent blow-out port 492 without being raised intemperature. In addition, because the temperature control damper 516suppresses flow passage resistance when cool air flows through the thirdfront passage 484, low electrical power consumption of the first blowerfan 560 is realized, along with reducing noise.

Next, in the case that the bi-level mode is selected by a controller(not shown) inside the vehicle compartment for blowing air in thevicinity of the faces and feet of passengers in the vehicle compartment,the first air mixing damper 488 is rotated to an intermediate positionbetween the third front passage 484 and the fourth front passage 486, sothat the first air is caused to flow respectively to both the thirdfront passage 484 and the fourth front passage 486. Furthermore, thetemperature control damper 516 is rotated, whereupon air heated by thefirst heating section 450 of the heater core 410 is supplied into thethird front passage 484 from the fifth front passage 514. At this time,the vent damper 494 is positioned at an intermediate position betweenthe first vent blow-out port 492 and the opening of the sixth frontpassage 520, and together therewith, the defroster blow-out port 524 isblocked by the defroster dampers 526 a , 526 b , whereupon thecommunication opening from the fifth front passage 514 to the sixthfront passage 520 is blocked by the sub-defroster dampers 518 a , 518 band communication therebetween is interrupted.

Herein, the first air (cooled air) flows from the second front passage482 to the third front passage 484. In this case, the temperaturecontrol damper 516 is oriented in a direction so as to be separated fromthe communication opening between the fifth front passage 514 and thethird front passage 484, while the end portion thereof is rotated toface the upstream side of the third front passage 484. Specifically, thefirst air (cooled air) is heated by the first heating section 450 of theheater core 410, and by mixing only at a small amount with the first air(heated air) that flows to the third front passage 484 through the fifthfront passage 514, air is blown directly from the first vent blow-outport 492, through the vent duct 544, and in the vicinity of the faces ofpassengers riding in the front seats in the vehicle compartment.

In this case, since the temperature control damper 516 is rotated sothat the end portion thereof confronts the upstream side of the thirdfront passage 484 and projects into the third front passage 484, warmair is guided to the upstream side of the third front passage 484 alongthe temperature control damper 516, and further mixing thereof withcooled air can be promoted. Further, concerning the heat dampers 528 inthe form of a butterfly valve, one end side thereof is rotated about thesupport axis to project toward the side of the sixth front passage 520(in the direction of arrow A), while the other end side thereof isrotated to project toward the side of the seventh front passage 522 (inthe direction of arrow B).

Consequently, warm air that is mixed with cool air in the third frontpassage 484 flows from the sixth front passage 520, through the seventhfront passage 522, and to the first heat passage 538, and is blown inthe vicinity of the feet of passengers in the front seats in the vehiclecompartment, and together therewith, is blown in the vicinity of thefeet of passengers in the middle seats in the vehicle compartment, fromthe eighth front passage 540 and through the second heat passage (notshown).

Further, the sub-defroster dampers 518 a , 518 b may be rotated so as toestablish communication between the fifth front passage 514 and thesixth front passage 520. As a result, air that passes through the firstheating section 450 of the heater core 410 is added to the first air,which has been supplied to the sixth front passage 520 via the thirdfront passage 484, whereupon warm first air can be supplied directlywith respect to the sixth front passage 520. Owing thereto, it ispossible to decrease ventilation resistance of the fluid passage and toincrease the blowing rate of warm air that is blown in the vicinity ofthe feet of passengers in the front seats in the vehicle compartmentfrom the first heat blow-out port (not shown). Stated otherwise, warmair blown in the vicinity of the feet of passengers can be supplied at amore stable temperature.

On the other hand, concerning the second air (cooled air), the secondair mixing damper 590 is rotated to an intermediate position whereby thesecond air flows to the second heating section 452 of the heater core410, and together therewith, flows to the third rear passage 592connected to the second rear passage 584. Specifically, the second air,after having been cooled by the second cooling section 438 of theevaporator 408, is divided in flow by the second air mixing damper 590,such that one portion is guided to the third rear passage 592 as cooledair, whereas the other portion thereof, after being heated by the secondheating section 452 of the heater core 410, is blown into the third rearpassage 592. As a result, the second air is adjusted to a suitabletemperature in the third rear passage 592.

The angle of rotation of the second air mixing damper 590 can be freelychanged in accordance with the temperature desired by passengers in thevehicle compartment, or stated otherwise, the second air mixing damper590 can be rotated in coordination with an input from the controller inthe vehicle compartment. Concerning the second air, which flowsdownstream through the third rear passage 592, the flow rate ratiothereof to the fourth rear passage 594 and the fifth rear passage 596 isadjusted by rotation of the mode switching damper 518 to a predeterminedposition. As a result, the second air is blown from the second ventblow-out port (not shown) in the vicinity of the faces of passengers inthe middle seats inside the vehicle compartment, or alternatively, isblown from the second heat blow-out port and the third heat blow-outport (not shown) toward the feet of passengers in the middle seats andrear seats inside the vehicle compartment. Herein, the predeterminedposition of the mode switching damper 598 is defined in accordance withthe set temperature and mode, which are input by a passenger from thecontroller inside the vehicle compartment. The set temperature and/ormode, apart from being input from the front seats, may also be inputfrom the middle seats or the rear seats.

Next, in the case that the heat mode for performing blowing of air inthe vicinity of the feet of passengers in the vehicle compartment isselected by the controller (not shown) in the vehicle compartment,compared to the case of the bi-level mode, the first air mixing damper488 is rotated more to the side of the third front passage 484. Further,the temperature control damper 516 is rotated somewhat to establishcommunication between the third front passage 484 and the fifth frontpassage 514. Furthermore, the cooling vent damper 490 blockscommunication between the second front passage 482 and the third frontpassage 484, and the vent damper 494 and the defroster dampers 526 a ,526 b are rotated respectively so that the first vent blow-out port 492and the defroster blow-out port 524 are closed.

At this time, similar to the aforementioned bi-level mode, concerningthe heat dampers 528 which are formed from a butterfly valve, one endside is rotated about the support axis to project into the sixth frontpassage 520 (in the direction of arrow A), whereas the other end side isrotated to project into the seventh front passage 522 (in the directionof arrow B).

As a result thereof, the heated first air that has passed through thefirst heating section 450 of the heater core 410 is supplied to thethird front passage 484 from the fifth front passage 514. In the thirdfront passage 484, the first air (cooled air), which has flowed in fromthe second front passage 482, is mixed with the first air (heated air),whereupon the mixed air passes through the sixth front passage 520 andthe seventh front passage 522 and flows rearwardly. In addition, afterbeing supplied to the first heat passage 538, air is blown from anon-illustrated first heat blow-out port in the vicinity of the feet ofpassengers riding in the front seat in the vehicle compartment, and fromthe eighth front passage 540 air is blown out via a non-illustratedsecond heat passage in the vicinity of the feet of passengers in themiddle seats in the vehicle compartment.

In this case, since the end of the temperature control damper 516 isrotated toward the upstream side of the third front passage 484projecting into the third front passage 484, the warm air is guideddownstream of the third front passage 484 along the temperature controldamper 516, and mixing thereof with the cooled air can be promoted.

Further, the sub-defroster damper 518 a , 518 b may be rotated toestablish communication between the fifth front passage 514 and thesixth front passage 520. In accordance therewith, air passes through thefirst heating section 450 of the heater core 410 and is added to thefirst air supplied to the sixth front passage 520 via the third frontpassage 484, and such heated first air can be supplied directly withrespect to the sixth front passage 520. Owing thereto, the air blowingrate of warm air, which is blown in the vicinity of the feet ofpassengers in the front seats in the vehicle compartment from the firstheat blow-out port, can be increased. Stated otherwise, warm air blownin the vicinity of the feet of passengers can be supplied at a morestable temperature.

On the other hand, compared to the case of the bi-level mode, the secondair mixing damper 590 is rotated somewhat to separate away from theheater core 410, whereupon second air, which has passed through thesecond heating section 452 of the heater core 410, flows downstreamthrough the third rear passage 592. By rotating the mode switchingdamper 598 to a position blocking the fourth rear passage 594, thesecond air passes through the fifth rear passage 596 and is blown in thevicinity of the feet of passengers in the middle and rear seats in thevehicle compartment from the second heat blow-out port and the thirdheat flow-out port (not shown).

Next, an explanation shall be made concerning a heat-defroster mode, inwhich by means of a controller (not shown) in the vehicle compartment,air is blown both in the vicinity of the feet of passengers in thevehicle compartment, and in the vicinity of the front window foreliminating fog (condensation) on the front window.

In the case of the heat-defroster mode, the defroster dampers 526 a ,526 b in the form of a butterfly valve are rotated about the supportaxis so as to separate from the defroster blow-out port 524, togetherwith blocking the first vent blow-out: port 492 by the vent damper 494(refer to the broken line in FIG. 3). As a result thereof, a portion ofthe first air (mixed air) that is mixed in the third front passage 484passes through the defroster blow-out port 524 and is blown in thevicinity of the front window of the vehicle. Further, another portion ofthe first air (mixed air) passes through the sixth and seventh frontpassages 520, 522, and is blown in the vicinity of the feet ofpassengers in the front seats in the vehicle compartment through thefirst heat passage 538, as well as being blown in the vicinity of thefeet of passengers in the middle seats in the vehicle compartment fromthe eighth front passage 540 through a non-illustrated second heatpassage.

Further, in the heat-defroster mode, in the case that second air isblown toward the middle seats and rear seats of the vehicle compartment,since this mode is the same as the heat mode discussed above, detailedexplanations thereof shall be omitted.

Lastly, the defroster mode for blowing air only in the vicinity of thefront widow for eliminating fog (condensation) from the front window inthe vehicle shall be described. In this case, the first air-mixingdamper 488 and the cooling vent damper 490 block communicationrespectively between the second front passage 482 and the third frontpassage 484. At the same time, the vent damper 494 blocks the first ventblow-out port 492 and blocks communication between the vent duct 544 andthe third front passage 484, while the temperature control damper 516establishes communication between the fifth front passage 514 and thethird front passage 484. Further, the heat dampers 528 in the form of abutterfly valve are rotated about the support axis, so that one endthereof blocks the eighth front passage 540 and the other end thereofblocks the seventh front passage 522, respectively.

On the other hand, the sub-defroster dampers 518 a , 518 b and thedefroster dampers 526 a , 526 b in the form of butterfly valves arerotated to establish communication between the fifth front passage 514,the sixth front passage 520, and the defroster blow-out port 524. As aresult, warm first air that has passed through the heater core 410 issupplied from the fifth front passage 514, through the sixth frontpassage 520, and to the opened defroster blow-out port 524, whereby warmair is blown in the vicinity of the front window in the vehicle. In thiscase, the second blower unit 412 is not driven, and only the first airsupplied from the first blower unit 406 is blown out.

In the foregoing manner, in accordance with the present embodiment, theevaporator 408, which is disposed in the casing 402, is equipped withthe first cooling section 436 that faces the first front passage 424 andthrough which air supplied from the first blower unit 406 passes, andthe second cooling section 438 that faces the first rear passage 570 andthrough which air supplied from the second blower unit 412 passes. Apartitioning means (first and second partitioning members 464, 466) isdisposed between the first cooling section 436 and the second coolingsection 438 for the purpose of blocking communication (i.e.,intermixing) of air in the first and second cooling sections 436, 438.Consequently, owing to the partitioning means installed between thefirst cooling section 436 and the second cooling section 438, intervalsbetween the multiple tubes 458 a , 458 b that constitute the evaporator408 are blocked, and since flow of air between the tubes 458 a , 458 bis interrupted, flowing of air between the first cooling section 436 andthe second cooling section 438 is prevented.

Stated otherwise, the first cooling section 436 and the second coolingsection 438 are separated from one another in the interior of theevaporator 408 by the aforementioned partitioning means, and togethertherewith, the partitioning means is disposed substantially parallel tothe blowing direction of the air that passes through the interior of theevaporator 408.

More specifically, the air supplied from the first blower unit 406 tothe first front passage 424 is reliably prevented from flowing in theevaporator 408 to the side of the second cooling section 438 thatcommunicates with the first rear passage 570, and similarly, the airsupplied from the second blower unit 412 to the first rear passage 570is reliably prevented from flowing in the evaporator 408 to the side ofthe first cooling section 436 that communicates with the first frontpassage 424.

As a result, in a condition where the second blower unit 412 is haltedwhile only the first blower unit 406 is driven, air supplied from thefirst blower unit 406 to the first front passage 424 is preventedreliably by the partitioning means from passing through the interior ofthe evaporator 408 and flowing to the side of the first rear passage 570and the second rear passage 584, which are intended to be supplied withair from the second blower unit 412. Conversely, in a condition wherethe first blower unit 406 is halted while only the second blower unit412 is driven, air supplied to the first rear passage 570 by the secondblower unit 412 is prevented by the partitioning means from passingthrough the interior of the evaporator 408 and flowing to the side ofthe first front passage 424 and the second front passage 482. Owingthereto, blowing of air mistakenly into the vehicle compartment fromblow out ports (air blowing ports) for which blowing of air has beenstopped can be prevented, so that a sense of discomfort is not impartedto vehicle occupants due to unintentional blowing of air.

Furthermore, in the same manner as the evaporator 408, the heater core410 is separated into the first heating section 450 that faces thefourth front passage 486 and through which the air supplied from thefirst blower unit 406 passes, and the second heating section 452 thatfaces the second rear passage 584 and through which the air suppliedfrom the second blower unit 412 passes. A partitioning means is disposedbetween the first heating section 450 and the second heating section 452for the purpose of blocking communication (i.e., intermixing) of air inthe first and second heating sections 450, 452. Consequently, owing tothe partitioning means installed between the first heating section 450and the second heating section 452, intervals between the multiple tubes496 that constitute the heater core 410 are blocked, and since flow ofair between the tubes 496 is interrupted, flowing of air between thefirst heating section 450 and the second heating section 452 isprevented. Further, the partitioning means may be disposed substantiallyparallel to the blowing direction of air that passes through the heatercore 410.

The vehicular air conditioning apparatus according to the presentinvention is not limited to the above-described embodiment, and it is amatter of course that various modified or additional structures could beadopted without deviating from the essence and gist of the invention asset forth in the appended claims.

1. A vehicular air conditioning apparatus including a casing having aplurality of passages through which air flows, cooling means disposedinside the casing for cooling air and supplying cooled air, heatingmeans disposed inside the casing for heating air and supplying heatedair, a damper mechanism for switching a flow state of the air in thepassages, and a first blower and a second blower, which are connected tothe casing for supplying the air to the inside of the casing, whereinthe casing comprises: a first passage to which the air from the firstblower is supplied; a second passage to which the air from the secondblower is supplied; a first heat exchanging section disposed in thecooling means and/or the heating means, which faces toward the firstpassage and performs cooling and/or heating of the air that flowsthrough the first passage; a second heat exchanging section disposed inthe cooling means and/or the heating means, which faces toward thesecond passage and performs cooling and/or heating of the air that flowsthrough the second passage; and separating means disposed between thefirst heat exchanging section and the second heat exchanging section,for blocking flow of the air that has passed through the interior of thecooling means and/or the heating means.
 2. The vehicular airconditioning apparatus according to claim 1, wherein the separatingmeans is disposed substantially parallel to a blowing direction of airthat passes through the interior of the cooling means and/or the heatingmeans.
 3. The vehicular air conditioning apparatus according to claim 1,wherein the air supplied from the first blower through the first passageis supplied in a direction of a predetermined seat or a group ofpredetermined seats in the vehicle, and wherein the air supplied fromthe second blower through the second passage is supplied in a directionof another seats or a group of other seats in the vehicle.
 4. Thevehicular air conditioning apparatus according to claim 2, wherein theair supplied from the first blower through the first passage is suppliedin a direction of a predetermined seat or a group of predetermined seatsin the vehicle, and wherein the air supplied from the second blowerthrough the second passage is supplied in a direction of another seat ora group of other seats in the vehicle.